Anti-corrosion Property of a New Non-toxic Blacken film on Steel Surface

A new non-toxic blackening liquid used for steel surface anti-corrosion treatment was developed through single factor and orthogonal experiments.Using corrosion resistance of the black film as test index,the effect of prescription ingredients on anti-corrosion property of the black film was studied.The result of SEM showed that the dense and uniform black film was formed on A3 steel.Polarization curves revealed that the black film could reduce the corrosion rate of the substrate material greatly and increase the corrosion potential of the metal.